add "poll sources" - objects that can provide additional filenos for polling

src/IRCBot.py

@@ -1,7 +1,7 @@
 import enum, queue, os, queue, select, socket, sys, threading, time, traceback
 import typing, uuid
 from src import EventManager, Exports, IRCServer, Logging, ModuleManager
-from src import PollHook, Socket, Timers, utils
+from src import PollHook, PollSource, Socket, Timers, utils
 
 VERSION = "v1.12.0"
 SOURCE = "https://git.io/bitbot"
@@ -80,8 +80,12 @@ class Bot(object):
         self._poll_timeouts.append(ListLambdaPollHook(
             lambda: self.servers.values(), self._throttle_timeout))
 
+        self._poll_sources = [] # typing.List[PollSource.PollSource]
+
     def add_poll_hook(self, hook: PollHook.PollHook):
         self._poll_timeouts.append(hook)
+    def add_poll_source(self, source: PollSource.PollSource):
+        self._poll_sources.append(source)
 
     def _throttle_timeout(self, server: IRCServer.Server):
         if server.socket.waiting_throttled_send():
@@ -311,16 +315,24 @@ class Bot(object):
 
     def _write_loop(self):
         while self.running:
+            poll_sources = {}
             with self._write_condition:
-                writeable = False
+                fds = []
                 for fd, server in self.servers.items():
                     if server.socket.waiting_immediate_send():
-                        self._write_poll.register(fd, select.POLLOUT)
+                        fds.append(fd)
-                        writeable = True
 
-                if not writeable:
+                for poll_source in self._poll_sources:
+                    for fileno in poll_source.get_writables():
+                        poll_sources[fileno] = poll_source
+                        fds.append(fileno)
+
+                if not fds:
                     self._write_condition.wait()
                     continue
+                else:
+                    for fd in fds:
+                        self._write_poll.register(fd, select.POLLOUT)
 
             events = self._write_poll.poll()
 
@@ -339,9 +351,25 @@ class Bot(object):
                         event_item = TriggerEvent(TriggerEventType.Action,
                             self._post_send_factory(server, lines))
                         self._event_queue.put(event_item)
+                    elif fd in poll_sources:
+                        poll_sources[fd].is_writeable(fd)
 
     def _read_loop(self):
+        poll_sources = {}
         while self.running:
+            new_poll_sources = {}
+            for poll_source in self._poll_sources:
+                for fileno in poll_source.get_readables():
+                    new_poll_sources[fileno] = poll_source
+            for fileno in new_poll_sources:
+                if not fileno in poll_sources:
+                    poll_sources[fileno] = new_poll_sources[fileno]
+                    self._read_poll.register(fileno, select.POLLIN)
+            for fileno in list(poll_sources.keys()):
+                if not fileno in new_poll_sources:
+                    del poll_sources[fileno]
+                    self._read_poll.unregister(fileno)
+
             events = self._read_poll.poll()
 
             for fd, event in events:
@@ -350,6 +378,9 @@ class Bot(object):
                     with self._rtrigger_lock:
                         self._rtrigger_server.recv(1024)
                         self._rtriggered = False
+                elif fd in poll_sources:
+                    poll_sources[fd].is_readable(fd)
+                    self.trigger_write()
                 else:
                     if not fd in self.servers:
                         self._read_poll.unregister(fd)

src/PollSource.py

@@ -0,0 +1,12 @@
+import typing
+
+class PollSource(object):
+    def get_readables(self) -> typing.List[int]:
+        return []
+    def get_writables(self) -> typing.List[int]:
+        return []
+
+    def is_readable(self, fileno: int):
+        pass
+    def is_writable(self, fileno: int):
+        pass